USB charger



FIG. 1 is a front elevation view of a USB charger;

FIG. 2 is a rear elevation view of the USB charger;

FIG. 3 is a left side elevation view of the USB charger, and the right view is a mirror image of the left view;

FIG. 4 is a bottom plan view of the USB charger;

FIG. 5 is a top plan view of the USB charger;

FIG. 6 is a first perspective view of the USB charger;

FIG. 7 is a second perspective view of the USB charger;

FIG. 8 is a third perspective view of the USB charger; and,

FIG. 9 is a fourth perspective view of the USB charger.

The broken lines shown in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a USB charger, as shown and described. 